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Text E. Network topology

Topologyrefers to the shape of a network. There are three basic physical topologies:

Bus: In abus network, the computers are all connected to a main cable which is known as the bus. All the data is sent along this one cable. It needs special devices at the ends of the bus calledterminators which absorb signals so that they don't get reflected back into the network and cause data corruption. Bus networks are usually easy and cheap to install. There is little to go wrong, but if a fault occurs the whole network is likely to be affected. They have generally been superseded by star networks.

Star:In astar network, each computer and peripheral is connected to a central hub or switch by its own cable. Star networks are more difficult to install than bus networks because there is more cabling. However, if one of the cables fails, the rest of the network will continue to operate. But if a hub or switch fails, none of the devices connected to it will be able to communicate.

Ring: the workstations are connected to one another in a closed loop configuration.

There are also mixed topologies like the tree,a group of stars connected to a central bus. Two common patterns are a bus network and a star network.

3.11 Read the descriptions of different physical topologies of communication

networks and match them with the terms in the text “Network topology”:

1) All the devices are connected to a central station.

2) In this type of network there is a cable to which all the computers and

peripherals are connected.

3) Two or more star networks connected together; the central computers

are connected to a main bus.

4) All devices (computers, printers, etc.) are connected to one another

forming a continuous loop.

3.12 Use the words in the box to complete the sentences:

1) All the PCs on a ______________are connected to one ___________,

which is a powerful PC with a large hard disk that can be shared by everyone.

2) The style of ___________networking permits each user to share

resources such as printers.

3) The star is a topology for a computer network in which one computer

occupies the central part and the remaining _________are linked solely to it.

4) At present Wi-Fi systems transmit data at much more than 100 times

the rate of a dial-up modem, making it an ideal technology for linking computers to one another and to the Net in a __________.

5) All of the fiber-optic ____________of the United States, Canada and

Latin America cross Panama.

6) A ____________ joins multiple computers (or other network devices)

together `to form a single network segment, where all computers can communicate directly with each other.

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